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    Boilers and CORGI registered engineers

    Provided that they are not doing the work as part of a business (they are not being paid to do it), they are allowed to do any repair work that they are competent to undertake. Proving competency is the important bit. Normally, this would involve being assessed under the Nationally Accredited...
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    Glow Worm Majorca Two

    Most boiler manufacturers supply copies of their manuals free of charge. So contact Glow Worm Sales & Literature on: 01773 596105.
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    pressure release"relief" valve--cost of

    About £16 + VAT, but check for your boiler here
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    CH only working when HW turned on.

    There is a micro-switch in the CH 2-way motorised valve that should close as the valve opens, to supply 240 Volts to the boiler and pump. Either this switch is faulty or there's a break in the wire from it to the boiler. If it is the switch that has failed, then you may be able to just...
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    Potterton PUMA 100 - must be a simple explanation?

    The air/nitrogen pressure of your expansion vessel may be low (or the vessel could be too small for your system). The central heating water expands as it heats up. If the vessel cannot handle this expansion, then the water pressure will build up until the pressure relief valve opens (at about 3...
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    Problems with a new radiator

    Have you tried turning off all your other radiators, to use the full force of the pump to shift any air that may be trapped in the pipework to the new radiator?
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    Primatic

    By design there is an air lock in this type of cylinder. It keeps the central heating water and domestic hot water separate. You bled the radiators, but did you also bleed the pump, boiler and other vents around your central heating system? If your boiler has an automatic air vent, check that...
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    Boiler working but not firing to heat shower water

    Elki, Clearly, the water flow rate through the boiler, to your bathroom, is too low to operate the boiler's domestic hot water flow switch. In the morning, time how long it takes to fill a measuring jug (or bottle of known volume) from a hot tap in your bathroom. Work out the flow rate in...
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    Baxi Bahama 100 Expansion Vessel Pressure when cold

    Unfortunately, you cannot check the expansion vessel's gas charge pressure with water in the boiler. The boiler must be drained first. The water pressure pushes the expansion vessel's diaphragm across, compressing the gas on the other side. When the two pressures are equal the diaphragm stops...
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    glow worm swiftflow 120 combi

    Glowworm Swift flow boilers usually have a DHW high limit switch wired in series with the air pressure switch. Some models also have a water pressure switch in series.
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    Pilot Light - Goes OUT - Wickes 40/50 Boiler

    You may find the reply to a similar problem, posted here, helpful.
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    Boiler overheating then extinguishing

    The boiler has a pump overrun thermostat, which keeps the pump running until the boiler has cooled down. As COG suggested, a low water flow rate through the boiler is the likely cause of the problem. The pump could be running slow because of a build-up of sludge on its rotor or its bearings...
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    Vailant Boiler - Heating Problem

    When you turn on a hot tap, the water flows through a venturi at the bottom of the diverter valve. This creates a differential pressure, which is applied to either side of a diaphragm (located just above the venturi) to provide the force to move the diverter valve, using a push rod. The push...
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    advice on leaking heating pipe

    It could be caused by a leak or by a flux residue that wasn't cleaned off after the elbow was soldered. Thoroughly clean the pipe and fitting. If the corrosion reappears, then you know you have a leak.
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    Vaillant Turbomax plus 828e F28 lockout code

    If the gas supply to the boiler was turned off then it is possible that there could be air in the boiler's gas pipework. If this is the case, then the boiler will not light until the air is purged (repeatedly trying to re-light the boiler may achieve this).
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    ERRATIC OPERATION OF BOILER

    Check the wiring to the cylinder stat. The wires to terminal 1 and terminal C may have been transposed (terminal C should be connected to the programmer and terminal 1 to the boiler). I've posted a wiring diagram (only in ASCII art) here. NB There's a mistake in the voltage table provided -...
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    hmm..broken or not

    It sounds like you didn't manage to get all the air out of the system before you powered it up. As well as bleeding the air from the radiators, you must also bleed any high point air vents and the pump itself. Water in the pump's casing cools the windings and lubricates the bearings. The...
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    Help! Don't know how to ignite heater.

    There are some intructions for lighting a Potterton Prima (model number is not specified) posted here If you call Potterton's Customer Services Department, on 08706 049049, they will explain how to light the boiler. They will also send you a free copy of the User Instructions and the...
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    Installing new boiler, help

    The maximum flue length for a vertical flue system on a Vaillant ecoMAX 828 boiler is: 10.0m (32 ft) using the Standard Concentric System (60/100mm) 29.0m (95 ft) using the Optional Concentric System (80/125mm) NB The 10.0m length has to be reduced by 1.0m for each addition 90° elbow...
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    pressure vessel

    You'll have to drain the wet side of the expansion vessel (it needs to be open to the atmosphere) before you recharge the gas side. Otherwise, when you try to check the gas pressure, you will actually be checking the pressure of the water on the other side of the diaphragm. You may find this...
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